Sounds and Ringtones
Default settings on the iPhone with iOS 5 or iOS 6 installed are set up so that when an incoming text or MMS message arrives, the device reminds you with two alerts. This repeated alert every 2 minutes can make sure you know a message came in, or it can be really annoying as you think the iPhone is receiving multiple SMS alerts in a row.
To switch off these reminder alerts, follow these steps:
1. Navigate to Settings -> Notifications -> Messages
2. Scroll to the bottom of the page and tap Repeat Alert
3. Select how many times you want to be reminded of each text message
Some iPhone owners have had their ring/silent switch stop working. In some cases the switch gets stuck on ring, which means that entering silent mode requires special workarounds to fix. In other cases, the switch gets stuck on mute, which means your iPhone will only vibrate or be silent depending on the settings.
You can filter out unwanted texts by assigning a silent text tone to specific contacts in your list. You can also set a silent text tone as the default and use normal text tones for people you want to hear text messages from.
The iPhone comes with a silent text tone. You will find this under Settings -> Sounds -> Text Tone -> None. You can set this silent text tone for specific contacts or as the default on your iPhone.
Much like with ringtones, you can make sure you always know who sent a text by assigning text tones to contacts. To assign a text tone other than the default text tone to a contact follow these instructions:
1. Open your Contacts.
2. Select the name of the contact you wish to customize.
3. Touch the Edit button in the upper right corner of the screen. Scroll down and select text tone.
4. Choose the desired text tone from the list. The text tone will play.
5. Press the Save button.